| 摘要 |
Aspects and embodiments of the present invention relate to copy protection of media products. Exemplary media products are DVD products and the like. According to some embodiments, such media products ( 745 ) may carry, in a data area ( 740 ), presentation data ( 325 ), navigation data ( 330 ) and read barriers (AV 3 ), the navigation data ( 330 ) providing a plurality of selectable playback paths and providing selection logic (SLn) for selecting a playback path during playback of the product. At least one selectable playback path (MP 2 ) of the product encounters a read barrier (AV 3 ) and at least one other selectable playback path (MP 1 ) does not encounter a read barrier.
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